Perhaps you should try some spelling variations:
phuong dong » phuong dung, phuong hoang, chuong duong
trinh luan » trinh luat, trinh quan, trinh toan
trinh han » trinh quan
von thanh » van thanh, son thanh, gon thanh
thanh cau » thanh chau, thanh mau, nhanh cau
dong von » dung von, dong co, dong hoc
ho lieu » co lieu, ho kieu, ho chieu
so lieu » so dieu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho lieu) OR (so lieu)) tinh - hanh ((trinh luan) OR (trinh han)) phuong dong von thanh cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho lieu) OR (so lieu)) tinh - hanh ((trinh luan) or (trinh han)) phuong dong von thanh cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho lieu) OR (so lieu)) tinh - hanh ((trinh luan) or (trinh han)) phuong dong von thanh cau*.